'The laboratory tests have proved successful, while we still have to conduct field tests,' he added.

Ukraine's Crimea Autonomy is one of most vulnerable places for bird flu outbreaks, as migrant birds use the autonomy as a stopover during their migration. Last year, bird flu outbreaks were registered in Crimea's 42 residential areas.

Ivanov added that it is highly likely the vaccine will work, as results of laboratory tests proved that the vaccine 'is very effective.'

Russia completed the first phase of clinical trials for a human vaccine against the H5N1 bird flu virus in late March.

Researchers said they had developed vaccine production techniques and commercial production could be started immediately in the event of a pandemic.